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@@ -8,3 +8,23 @@ interface Manager extends Employee {
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numOfEmployees: number;
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scheduleMeeting: (topic: string) => void;
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}
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+
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+// Implements Employee and more, so:
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+// - can be used as an Employee parameter
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+// - is not of type Employee
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+// TS calls this a "structural type system" aka "duck typing": interfaces as
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+// matches as implemented even when not declared, like in Go.
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+let dev = {
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+ name: 'hr',
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+ title: 'senior TS dev',
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+ editor: 'VSCode',
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+};
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+
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+let employee : Employee = dev;
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+
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+function foo(e: Employee) {
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+ console.log(e.name + ": " + e.title);
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+}
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+
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+foo(dev);
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+foo(employee);
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